EP 0224298 A2 19870603 - Novel ferrofluids for use in cementing wells.
Title (en)
Novel ferrofluids for use in cementing wells.
Title (de)
Ferrofluide für die Zementierung von Bohrlöchern.
Title (fr)
Fluides ferreux à utiliser dans la cimentation de puits.
Publication
Application
Priority
US 79852785 A 19851115
Abstract (en)
Novel cemetitious and non-cementitious ferrofluids are disclosed which have properties making them suitable for use in cementing wells. The cementitious fluids comprise: (a) a hydraulic cement, (b) finely divided magnetic particles, (c) a binding agent or a surfactant, and (d) a liquid medium. The binding agent or surfactant is present in the compositions in an amount sufficient to render the compositions stable in a magnetic filed. When used in cementing wells, the cementitious ferrofluids are implaced in the annulus separating a casing from the formation in a wellbore by conventional techniques and the slurry is subsequently subjected to an activating magnetic field that causes movement of the magnetic particles in the slurry. The non-cementitious ferrofluids comprise: (a) finely divided magnetic particles, (b) stabilizing agent, and (c) a liquid medium. The movement of the magnetic particles results in a "scrubbing" action against the surface of the casing and the formation and a mixing of the slurry which helps displace any residual drilling mud. The net result is better bonding of the cement.
IPC 1-7
IPC 8 full level
B01F 13/08 (2006.01); C04B 14/30 (2006.01); C04B 14/34 (2006.01); C04B 28/02 (2006.01); C04B 40/02 (2006.01); C09K 8/42 (2006.01); C09K 8/46 (2006.01)
CPC (source: EP US)
B01F 33/451 (2022.01 - EP US); C04B 14/30 (2013.01 - EP US); C04B 14/34 (2013.01 - EP US); C04B 28/02 (2013.01 - EP US); C04B 40/0209 (2013.01 - EP US); C09K 8/42 (2013.01 - EP US); C09K 8/46 (2013.01 - EP US); E21B 33/13 (2013.01 - EP US); B01F 2101/49 (2022.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
EP 0224298 A2 19870603; EP 0224298 A3 19880803; CA 1261130 A 19890926; US 4691774 A 19870908; US 4802534 A 19890207
DOCDB simple family (application)
EP 86201985 A 19861113; CA 499014 A 19860106; US 79852785 A 19851115; US 9293887 A 19870904